Improvement in molding pottery-ware



UNITED STATES PATENT OFFICEo ROBERT J. MARCHER, OF NEW YORK, N. Y.

IMPROVEMENT IN MOLDING POTTERY-WARE.

Specification forming part of Letters Patent No. 38,905, dated June 16,1863.

.To all whom it may concern.-

Be it known that l, ROBERT J. MARCHER, of the city, county, and State ofNew York, have invented a new and Improved Device for MoldingPottery-Ware 5 and I do hereby de- Clare that the following is a full,clear, and exact description of the same, reference being had to theaccompanyin g'drawin gs, forming a part of this specification, in which-Figure l is a vertical central section of my invention, taken in theline .fr fr, Fig. 2 Fig. 2, a plan or top view of the same; Fig. 3, asection of a portion of the same, taken in the line y y, Fig. l; Fig. 4,a section ofthe same, taken in the line z z, Fig. 1; Fig. 5, a sectionof a disk molded by my invention.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to a new and improved machine for moldingelliptical disks of pottery-ware 5 and it consists in the employment oruse of an upright eccentric lathe in connection with a yielding former,and also with a cam to operate said former when required.

The object of the invention is to obtain a device which will supersedethe ordinary exclusive manual process of forming potteryware vessels ofthis kind by admitting of the desired work being performed far more eX-peditiously and in a more perfect manner.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A represents an upright shaft, the lower end of which is stopped in thelower part of a framing, B, and has a horizontal plate, C, attached toits upper end. On this plate C there are secured two parallel bars, a a,the

inner surfaces of which are grooved longitudi nally in dovetail form, asshown at b b in Fig. 3. The bars a a serve as guides for a slide, D, theedges of which are beveled to iit and slide freely in the grooves b I).-To the upper surface of the slide D there is secured an oval plate, F,and to the under side of said slide there are attached two pendants, co, which project down at opposite sides of a circular projection, G,fixed permanently on the framing B, and in an eccentric position withthe shaft A, as shown clearly in Fig. 1.

The parts above described form what is well known as the eccentric chuckor lathe, and

when the shaft A is rotated the plate F will, in consequence of thependants c c acting against the eccentric G, slide the plate F laterallyso that every point of its edge will work in contact with a fixed point.This eccentric chuck or lathe, being well known, does not require a moreminute description.

H represents a horizontal bar, one end of which has an oblong slot, d,made in it, in which a projection, e, is fitted. This slot (l is ofdovetail form as well as the projection e, in order that the bar may beretained on the projeetion, and the latter is shorter than the slot inorder to admit of a certain degree of longitudinal play of bar H. (SeeFig. l.) The projection eis secured to an upright, I, attached to theframing B, and the opposite end of the bar H rests in a slot, f, in theupper end of an upright, J, attached to the framing B. To the bar Hthere is attached a pendent plate, K, the lower edge of which is curvedor formed to correspond to the inner surface of the dish to be molded.(See Fig. l.)

L is a mold which is secured on the plate F. This mold may beconstructed of plasterof-paris, or any suitable cement or othersubstance, and its inner surface is made to correspond to the outersurface of the dish to be molded.

M is a pendant which is attached to the bar H, and has a spring, N,pressing against it, said spring being attached to the upright J, andc'iusin g the pendant M to bear against a cam, O, which is on the upperend of a shaft, P, in the framing B. This cam O gives a vibratingmovement to the bar H and plate F, and the shaft P is rotated by meansof gears Q from the shaft A. The cam O (represented in Figs. 1 and 2) issimply a fluted wheel, but the form may be varied or modified asrequired.

The operation is as follows: The shaft A is rotated by any convenientpower, and the clay is placed in the mold L and is made to conform tothe side thereof by means ofthe plate K, which may be termed a former.77This former smooths theinner side of the clay, gives the same a lutedform, owing to the vibrations communicated to it by means of the cam Oand spring N. This iuted form is'shown inred in Fig. 5, which representsa section of a dish. Diches may be molded with a smooth inrerior bydispensing with the cam O. Vhen the dish is molded, it is removed fromthe mold, the bar H being turned upward, which is admitted inconsequence of the projectione being attached to the upright I, by asingle screw, dx, and the operation repeated for a succeeding operation.The mold, it will be seen, gives the form to the outer side of the dish,while the plate or former gives the form to the inner'side. I wouldremark that a series of molds are used, so that when one dish isformed,it, with its mold, may be placed in the dryingroom, and a fresh moldplaced on the chuck or lathe for a succeeding operation. The moldeddishes shrink in drying, so that they may be readily removed fromthemolds. The Work, it will be seen, can be rapidly done and in aperfeet manner, and will effect a great saving in labor, as these dishesare now molded by hand on the exterior of a molda comparatively slowprocess.

Aeccentric chuck or lathe, for the purpose speciiied.

3. The cam O and spring N, or its equivalent, arranged to operate inconjunction with the plate or former K, mold L, and eccentric chuck orlathe, for the purpose set forth.

RoBT. J. MARCHER.

Witnessess PETER VAN ANTWERP, (JHns. GoUnER.

